Please, may someone explain this fact:
when the measurements are paired (made on the same subjects), tests for equal population SDs based on independent samples cannot be used. Then, a test of the equality of the initial and follow-up SDs is equivalent to testing for a correlation of 0 between the sums and differences of the measurement pairs
TIA
Ivan
. . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
